There is no problem with machining the rotors and reusing the old pads as long as the pads are in good condition.
On the car laths are preferred since the rotor can be machined in place and any combined runout from the hub can be machined out. But it's not fool proof, the user must still torque the hub adapter and the runout operation must be performed correctly. One other problem with machining rotors in place in the northern states is rust jacking. Rust jacking happened when a build up of rust between the hub and back side of a rotor starts to push the rotor away from the hub. This very seldom happens evenly and can cause runout to build up. When machining rotors in place they should be removed and any rust removed before machining. This step seldom happened when rotors are machined in place.
Mike
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“The significant problems we have cannot be solved at the same level of thinking with which we created them” (Albert Einstein) Moderator Brake Forum
If your needing to turn your rotors, there's a good chance your pads are what are causing your rotors to have ruts or groves in the first place, so it's better to replace them then to just reuse old pads.
If your needing to turn your rotors, there's a good chance your pads are what are causing your rotors to have ruts or groves in the first place, so it's better to replace them then to just reuse old pads.
would you do this even if you had 50% - 70% of the pad left???
If you see deep grooves in the pads, no matter how thick they are, you should replace them, or sand them down until they are flat. Then you can re-use them over the machined rotors.
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You really need to look at the pad surface. If there is cracking, if the surface seems much lighter then the rest of the pad, or if material flacks off, the pads are shot. Look for "rust jacking" between the steel backing plate and the pad material. If the pads are grooving the rotors then the material is much too aggressive and you should be looking for a different pad.
Mike
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“The significant problems we have cannot be solved at the same level of thinking with which we created them” (Albert Einstein) Moderator Brake Forum
turning rotors, rules of the game......
Linear Mode
